Until now, there has been no clear-cut evidence that beta blockers improve the survival of patients who have had heart failure.

With Microsoft, there is no such clear-cut evidence.

The most clear-cut evidence on the impact is from asset prices.

I returned to the main road without any clear-cut evidence the biker had come this way.

Over the years, you've heard a lot of rumors, but there has been no clear-cut evidence.

But despite some promising research, there is no clear-cut evidence to support its use for other health conditions.

But the data presented here today showed no clear-cut evidence of such transmission although they did not exclude such a possibility.

"Is there any clear-cut evidence of ownership on either side?"

There is no clear-cut evidence that global warming even exists.

President Karzai has resisted, however, demanding clear-cut evidence of wrongdoing, several officials said.